Leg Muscles Flashcards
Gastrocnemius origin
Posterior femur, proximal to lateral and medial condyles
Gastrocnemius insertion
Calcaneal tendon (Achilles) to calcaneal tuberosity
Gastrocnemius action
Flex knee (open chain), plantar flex ankle
Gastrocnemius innervation
Tibial nerve
Gastrocnemius blood supply
Medial head - medial sural artery
Lateral head - lateral sural artery
Soleus origin
Soleal line, proximal 1/3 posterior tibia and fibula
Soleus insertion
Calcaneal tendon to calcaneous
Soleus action
Plantar flex the ankle
Soleus innervation
Tibial nerve
Soleus blood supply
Popliteal artery, post tibial artery, peroneal artery
Plantaris origin
Lateral femoral epicondyle
Plantaris insertion
Calcaneous, anteromedial to Achilles tendon
Plantaris action
Weak plantar flexion of ankle, weak flexion of knee (open chain)
Plantaris innervation
Tibial nerve
Plantaris blood supply
Superficial- lateral sural artery
Deep - superior lateral genicular artery
Flexor digitorum longus origin
Middle 1/3 posterior surface of tibia
Flexor digitorum longus insertion
Distal phalanges of lateral 4 toes (2-5)
Flexor digitorum longus action
Flex toes 2-5
Weak plantar flexion and inversion of ankle
Flexor digitorum longus innervation
Tibial nerve
Flexor digitorum longus blood supply
Posterior tibial artery
Flexor hallucis longus origin
Middle 1/3 posterior surface of fibula
Flexor hallucis longus insertion
Distal phalanx of big toe
Flexor hallucis longus action
Flex big toe, weak ankle plantar flexion
Flexor hallucis longus blood supply
Posterior tibial artery
Flexor hallucis longus innervation
Tibial nerve
Tibialis posterior origin
Proximal 2/3 posterior surface of tibia, proximal 2/3 surface of fibula and interosseous membrane
Tibialis posterior insertion
Navicular, cuneiforms, cuboid, bases of MT 2-4
Tibialis posterior action
Ankle inversion
Tibialis posterior innervation
Tibial nerve
Tibialis posterior blood supply
Posterior tibial artery
Peroneous (fibularis) longus origin
Proximal 2/3 lateral surface of fibula
Peroneous longus insertion
Base of 1st metatarsal, medial cuneiform
Peroneous longus action
Ankle eversion, weak plantar flexion of ankle
Peroneous longus innervation
Superficial peroneal nerve
Peroneous longus blood supply
Peroneal artery
Peroneous brevis origin
Distal 2/3 lateral surface of fibula
Peroneous brevis insertion
Dorsal surface of 5th metatarsal
Peroneous brevis action
Ankle eversion, weak plantar flexion of ankle
Peroneous brevis innervation
Superficial Peroneal nerve
Peroneous brevis blood supply
Branches of peroneal and tibial arteries
Tibialis anterior origin
Lateral condyle of tibia, proximal 2/3 lateral surface of tibia
Tibialis anterior insertion
Medial cuneiform, base of 1st metatarsal
Tibialis anterior action
Dorsiflexion of ankle, ankle inversion
Tibialis anterior innervation
Deep fibular nerve
Tibialis anterior blood supply
Anterior tibial artery
Extensor digitorum longus origin
Lateral tibial condyle
Extensor digitorum longus insertion
Middle and distal phalanges 2-5
Extensor digitorum longus action
Extend toes 2-3, ankle eversion, ankle dorsiflexion
Extensor digitorum longus innervation
Deep fibular nerve
Extensor digitorum longus blood supply
Anterior tibial artery
Extensor hallucis longus origin
Middle 1/3 of anterior fibula
Extensor hallucis longus insertion
Distal phalanx of big toe
Extensor hallucis longus action
Extend big toe, ankle dorsiflexion and eversion
Extensor hallucis longus blood supply
Anterior tibial artery
Extensor hallucis longus innervation
Deep fibular nerve
Peroneous tertius origin
Fibula, common fibers from extensor digitorum longus
Peroneous tertius insertion
Dorsal surface, base of 5th metatarsal
Peroneous tertius action
Ankle dorsiflexion
Peroneous tertius innervation
Deep fibular nerve
Peroneous tertius blood supply
Dorsalis pedis artery